<template>
    <div class="app-container">
        <h2 style="text-align: center;">发布新课程</h2>
        <el-steps :active="2" process-status="wait" align-center style="marginbottom: 40px;">
            <el-step title="填写课程基本信息"/>
            <el-step title="创建课程大纲"/>
            <el-step title="提交审核"/>
        </el-steps>

        <el-button type="text" @click="openChapterDialog">添加章节</el-button>

        <!-- 章节 -->
        <ul class="chanpterList">
            <li v-for="chapter in chapterVideoList" :key="chapter.id">
                <p>
                    {{ chapter.title }}
                    <span class="acts">
                        <el-button type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                        <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                        <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                    </span>
                </p>

                <!-- 小节 -->
                <ul class="chanpterList videoList">
                    <li v-for="video in chapter.children" :key="video.id">
                        <p>
                            {{ video.title }}
                            <span class="acts">
                                <el-button type="text" @click="openEditVideo(video.id)">编辑</el-button>
                                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                            </span>
                        </p>
                    </li>
                </ul>
            </li>
        </ul>

        <div>
            <el-button @click="previous">上一步</el-button>
            <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
        </div>

        <!-- 添加和修改章节表单 -->
        <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
            <el-form :model="chapter" label-width="120px">
                <el-form-item label="章节标题">
                    <el-input v-model="chapter.title"/>
                </el-form-item>

                <el-form-item label="章节排序">
                    <el-input-number v-model="chapter.sort" :min="0" controlsposition="right"/>
                </el-form-item>
            </el-form>

            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
                <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
            </div>
        </el-dialog>

        <!-- 添加和修改课时表单 -->
        <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
            <el-form :model="video" label-width="120px">
                <el-form-item label="课时标题">
                    <el-input v-model="video.title"/>
                </el-form-item>

                <el-form-item label="课时排序">
                    <el-input-number v-model="video.sort" :min="0" controlsposition="right"/>
                </el-form-item>

                <el-form-item label="是否免费">
                    <el-radio-group v-model="video.Free">
                        <el-radio :label="true">免费</el-radio>
                        <el-radio :label="false">默认</el-radio>
                    </el-radio-group>
                </el-form-item>

                <!-- 上传视频 -->
                <el-form-item label="上传视频">
                    <el-upload
                        :on-success="handleVodUploadSuccess"
                        :on-remove="handleVodRemove"
                        :before-remove="beforeVodRemove"
                        :on-exceed="handleUploadExceed"
                        :file-list="fileList"
                        :action="BASE_API+'/eduvod/video/uploadALiyVideo'"
                        :limit="1"
                        class="upload-demo">

                        <el-button size="small" type="primary">上传视频</el-button>

                        <el-tooltip placement="right-end">
                            <div slot="content">最大支持1G，<br>
                                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                                SWF、TS、VOB、WMV、WEBM 等视频格式上传
                            </div>
                            <i class="el-icon-question"/>
                        </el-tooltip>
                    </el-upload>
                </el-form-item>

            </el-form>

            <div slot="footer" class="dialog-footer">
                <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
                <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
            </div>
        </el-dialog>

    </div>
</template>
<script>
import * as chapter from '@/api/edu/chapter'
import * as video from '@/api/edu/video'

export default {
    data() {
        return{
            saveBtnDisabled:false,
            courseId: '',
            chapterVideoList:[],
            chapter: {
                title: '',
                sort: 0
            },
            video:{
                title: '',
                sort: 0,
                Free: 0,
                videoSourceId: '',
                videoOriginalName: ''
            },
            dialogChapterFormVisible: false,
            dialogVideoFormVisible: false,
            fileList:[],
            BASE_API: process.env.VUE_APP_BASE_API
        }
    },
    created(){
        //獲取路由中的id值
        if(this.$route.params && this.$route.params.id){
            this.courseId = this.$route.params.id
            // alert(this.courseId)
            //執行獲取章節方法
            this.getChapterVideo()
        }
    },
    methods:{
        //============================如下是视频上传方法============================
        //点击确认建调用的方法
        handleVodRemove(){
            video.deleteALiyVideo(this.video.videoSourceId)
                .then(response => {
                    //提示信息
                    this.$message({
                                type: 'success',
                                message: '删除阿里云视频成功!'
                            });

                            //清空文件列表
                            this.fileList = []

                            //删除阿里云视频后，也要删除已经赋值的视频id
                            //视频id赋值
                            this.video.videoSourceId = ''
                            //视频名称赋值
                            this.video.videoOriginalName = ''

                })
        },

        //点击×调用的方法
        beforeVodRemove(file,fileList){
            return this.$confirm(`确认移除 ${ file.name }?`)    
        },

        //上传成功执行的方法
        handleVodUploadSuccess(response,file,fileList){
            //上传后的视频id赋值
            this.video.videoSourceId = response.data.videoId
            //上传后的视频名称赋值
            this.video.videoOriginalName = file.name
        },
        //上传视频执行的方法
        handleUploadExceed(){
            this.$message.warning('想要重新上传视频，请先删除已存在的视频')
        },
        //============================如下是小节方法============================

        //编辑小节
        openEditVideo(id){
            //弹框
            this.dialogVideoFormVisible = true
            //调用接口
            video.getVideoById(id)
                .then(response => {
                    this.video = response.data.video
                })
        },
        //删除小节
        removeVideo(id){
            this.$confirm('此操作将永久删除该小节记录, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                video.deleteVideo(id)
                    .then(response => {
                            //提示信息
                            this.$message({
                                type: 'success',
                                message: '删除小节成功!'
                            });

                        //刷新页面
                        this.getChapterVideo()
                    })
            })
        },
        //添加小节弹框的方法
        openVideo(chapterId){
            //弹框
            this.dialogVideoFormVisible = true

            //设置章节id到 video 对象里面
            this.video.chapterId = chapterId

            //清空表单
            this.video.title = ''
            this.video.Free = 0
            this.videoSourceId = ''
        },
        //添加小节方法
        addVideo(){
            //设置课程id到 video 对象里面
            this.video.courseId = this.courseId
            video.addVideo(this.video)
                .then(response => {
                    //关闭弹框
                    this.dialogVideoFormVisible = false
    
                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '添加小节成功!'
                    });
                    
                    //刷新页面
                    this.getChapterVideo()

                })
        },
        //修改方法
        updateVideo(){
            video.updateVideo(this.video)
                .then(response => {
                    //关闭弹框
                    this.dialogVideoFormVisible = false

                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '修改小节信息成功!'
                    });
                    
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        //确定方法
        saveOrUpdateVideo(){
            if (!this.video.id) {
                this.addVideo()
            } else {
                this.updateVideo()
            }
        },
        //============================如下是章节方法============================
        //删除章节信息
        removeChapter(chapterId){
            this.$confirm('此操作将永久删除该章节记录, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                chapter.deleteChapter(chapterId)
                    .then(response => {
                            //提示信息
                            this.$message({
                                type: 'success',
                                message: '删除章节成功!'
                            });

                        //刷新页面
                        this.getChapterVideo()
                    })
            })
        },
        //编辑章节页面
        openEditChapter(chapterId){
            //弹框
            this.dialogChapterFormVisible = true
            //调用接口
            chapter.getChapter(chapterId)
                .then(response => {
                    this.chapter = response.data.chapter
                })
        },
        //弹出添加章节页面
        openChapterDialog(){
            //弹框
            this.dialogChapterFormVisible = true

            //表单数据清空
            this.chapter.title = ''
            this.sort = 0

        },

        //添加章节
        addChapter(){
            //设置课程id到chapter对象里面
            this.chapter.courseId = this.courseId
            chapter.addChapter(this.chapter)
                .then(response => {
                    //关闭弹框
                    this.dialogChapterFormVisible = false
    
                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '添加章节成功!'
                    });
                    
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        //修改章节的方法
        updateChapter(){
            chapter.updateChapter(this.chapter)
                .then(response => {
                    //关闭弹框
                    this.dialogChapterFormVisible = false

                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '修改章节信息成功!'
                    });
                    
                    //刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdate(){
            if (!this.chapter.id) {
                this.addChapter()
            } else {
                this.updateChapter()
            }
        },
        getChapterVideo(){
            chapter.getAllChapterVideo(this.courseId)
                .then(response => {
                    this.chapterVideoList = response.data.list
                    // alert(response.data.list)
                })
        },
        previous(){
            //跳轉到第一步
            this.$router.push({path:'/course/info/' + this.courseId })
        },
        next(){
            //跳轉到第二步
            this.$router.push({path:'/course/publish/' + this.courseId })
        }
    }
}
</script>

<style scoped>
    .chanpterList{
        position: relative;
        list-style: none;
        margin: 0;
        padding: 0;
    }
    .chanpterList li{
        position: relative;
    }
    .chanpterList p{
        float: left;
        font-size: 20px;
        margin: 10px 0;
        padding: 10px;
        height: 70px;
        line-height: 50px;
        width: 100%;
        border: 1px solid #DDD;
    }
    .chanpterList .acts {
        float: right;
        font-size: 14px;
    }
    .videoList{
        padding-left: 50px;
    }
    .videoList p{
        float: left;
        font-size: 14px;
        margin: 10px 0;
        padding: 10px;
        height: 50px;
        line-height: 30px;
        width: 100%;
        border: 1px dotted #DDD;
    }
</style>
